Sin City Waist Trimmers Outdoor Fitness Boot Camp in Las Vegas, Nevada. 89074. Call with any questions 702-234-8234.. Sin City Waist Trimmers fitness BootCamp has been in business since 2007. Any questions about our fitness boot camp please call. We do all sorts of activities from Yoga, crossfit, positive motivation, strenth training, weight training, running, jogging, games, boot camp obstacle courses, free weights, weightloss. Boot Camp is for the average Joe and Jane smith to get into the best shape of thier life. We have classes in Las Vegas and Henderson. Call for a appointment to sign up for your free boot camp classes in Las Vegas and Henderson.